I am planning on using the Grace m108 as the mic settings can be saved and recalled instantly (for consistency over time) and because it is very clean.

Experimenting on the ideal setup will be the key. I don't mind forking out for 2 more Coles if it is going to enhance the final product. I am also going to get a new card 8 x 8 mkII card for my symphony chassis so as to capture the best possible A to D sound quality I can with my gear. One chassis has 2 8x8 mkI cards and the other chassis has the 2 x 6 SE card (which is superb) that I will use for the microphones behind the conductor.